← View Generic P0138 Guide
Severity: Medium
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Vehicle-Specific Guide
This guide is customized for your 2014 Nissan SENTRA
P0138: Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2
on 2014 Nissan SENTRA
Fix Cost
$50 - $250
Parts & Labor
Difficulty
2/5
30 mins - 1 hour
DIY Possible?
✅ Yes
Save money
Your Vehicle
2014 Nissan
SENTRA
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Important for 2014 Nissan SENTRA Owners
Before starting repairs, verify which engine your 2014 Nissan SENTRA has. Check your VIN or engine code to ensure you order the correct parts.
📖 What Does P0138 Mean on 2014 Nissan SENTRA?
The downstream oxygen sensor on bank 1 is reading consistently high voltage.
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Symptoms
- • Failed emissions test
- • check engine light
- • rich running condition indication.
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Common Causes
- • Faulty oxygen sensor
- • fuel system running rich
- • wiring short to power
- • contaminated sensor.
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How to Fix P0138 on 2014 Nissan SENTRA
Replace oxygen sensor, diagnose rich fuel condition, repair wiring shorts, clean sensor area.
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Need Maintenance Info for Your SENTRA?
Get oil capacity, filter specs, and torque settings for your specific 2014 Nissan SENTRA.
View 2014 Nissan SENTRA SpecsParts for 2014 Nissan SENTRA
Essential Tool
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Related Diagnostic Codes
Other codes that may appear with P0138
P0136
Sequential Code
Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
Medium
P0137
Sequential Code
Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2
Medium
P0139
Sequential Code
Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2
Medium
P0140
Sequential Code
Oxygen Sensor Circuit No Activity Bank 1 Sensor 2
Medium
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system